Asymmetric CrossFire

Asymmetric CrossFire is supported by desktop Llano APUs. You can combine your A6 or A8 with a Radeon HD 6450, 6570 or 6670 and have both GPUs work in tandem. There are some limitations as we found - mainly asymmetric CF only works in DX10 or DX11 games. While DirectX 9 titles will still function, performance will be suboptimal as you'll soon see.

AMD Radeon Dual Graphics Branding

Discrete GPU

6550D

6530D

HD 6670

HD 6690D2

HD 6690D2

HD 6570

HD 6630D2

HD 6610D2

HD 6450

HD 6550D2

HD 6550D2

Getting asymmetric CrossFire working was a breeze. ASRock's BIOS was setup by default to allow for a secondary discrete GPU to function in dual-graphics mode, all I had to do was install a Radeon HD 6570. My monitor remained plugged into the motherboard and the driver handled the rest:

If you're running a DX10/DX11 game you can get positive scaling, however the gains vary. In Crysis we saw a 68% increase in performance over the APU alone, but only a 12% increase over the discrete GPU by itself:

HAWX showed us bigger gains on both sides. We saw a more than 2x improvement over the APU alone and a 32% increase over the Radeon HD 6570 by itself:

Fire up a DX9 game (or a DX10/11 game in DX9 mode) however, and the results are disappointing. You actually get lower performance than if you had stuck with the discrete GPU alone:

Hello everyone, i just registered but this site is realy ny favorite for review and i am browsing it alot.now on the subject, what i realy think is that these apu's might not be very dominating in theyr performance but they are realy good for gaming and that asymmetric CrossFire thingy is realy one hell of a thing, for people like me that dont have alot of $ to spend on new pc and loves gaming it should be wery good selection, only thing that interests me is that if i could do that asymmetric CrossFire with my old ati radeon hd 3870, i still love it and it is still powerfull for me on 1440x900 resolution. so as i was saying, it might not be dominating in its porformance with programs but it is fantastic thing for gaming.Reply

I'm interested in how desktop Llano compares in performance to laptop Llano, but found it impossible to compare. The difference in resolutions is excusable (though as has been commented, the resolutions in this article are very old and should be replaced), but then you have different sets of games, and when there's an overlap they are ordered differently, and are run with different options, be it DX9 vs. DX10 or low vs. medium, ... It's a real pain.Reply

First, thanks for your review, I have been eagerly looking forward to it for months now !

A thought has occured to me when I got to Conclusion section of your article: how does A8-3850 + Asymmetric Crossfire fare compared to similarly priced Athlon/Phenom II + single discrete GPU - whatever RAM APU uses up ?

Say A8-3850 = $135, HD6670 (the strongest card for Asymmetric Crossfire) = $84 on Newegg, how do these compare to identically priced Phenom II 955BE (= $115) + HD6750 (= $105), assuming one can get FM1 at the same price as AM3 with identical features ? In other words: is Asymmetric Crossfire worth the hassle of upgrading your platform, assuming ideal circumstances (they are going to fix DX9 at some point, I'm sure) ?Reply

Great review, solid baseline for initial review, something we can always expect from Anand. Few of your review members dough miss quite a bit training to get to a certain level..... you are to kind to them when you review it before posting :)

Hope to see a decent review on OC and potential of this chip also combined OC + CF

one remark, since when does a general users need cpu horse power like SNB 2100, they don't, they would be more then fine with Pentium alike SNB and for the record while benchmarks might show quite a bit of performance difference in single threaded benchmarking apps, common use for browsing, office etc it has 0 added value with this kind of CPU performance.... in atom alike platforms it is more then noticable. Put any unknown user behind either platform compared here for general tasks and they will be fine with both, once you startup any game worth mentioning (even SIMS) they will notice the difference what to choose.Reply

But in "common use for browsing, office, etc" then quad core multithreaded performance is almost completely useless. I don't know why people keep bringing up common use office applications as a win for Llano.Reply

Whatever floats your boat, but AT needs to make sponsor money too you know, it's not like they could say "i3-2100 is useless don't buy it".

Besides, the only way to compare two cpu's for gaming today is the following : which one enables the fastest GPU operation and general game score for a given budget (i.e. core i3-2100 + hd 6950 > core i5 + hd6750).

As you mentioned, video encoding and rendering should NOT be a relevant part of a review, most people don't do it at all (yes, I download x264, but there's like 15 different people tops encoding these and it serves millions of users).

And rendering... why not complex HPC-type stuff ? Database benchmarks (even that is MORE relevant than rendering) ? SuperPI ... now that's relevant for a user :) - at least if he participates in LN2 OC Competitions, like everyone and their dog.Reply